WO2008092387A1

WO2008092387A1 - A method and apparatus for transmitting signal and a communication system

Info

Publication number: WO2008092387A1
Application number: PCT/CN2008/000284
Authority: WO
Inventors: Yingmin Wang; Shaohui Sun; Yongbin Xie; Yuemin Cai; Hai Tang
Original assignee: Datang Mobile Communications Equipment Co., Ltd
Priority date: 2007-01-26
Filing date: 2008-02-03
Publication date: 2008-08-07
Also published as: US20100085934A1; EP2120413A1; EP2120413A4; CN101232484B; JP2010517389A; US8289919B2; CN101232484A

Abstract

A method, apparatus and system for transmitting signal, the method includes: using the weighting factor sequence, processing weighting repeating modulation for the basic cell block mapped by the data symbol block at the sending end, and obtaining a plurality of the repeating cell blocks corresponding to the said basic cell block; the sending end maps each repeating cell block to the appointed time-frequency position respectively, then sends the signals in the said time-frequency position; and the receiving end demodulates the plurality of data symbol blocks from the blocks, and incorporates the plurality of data symbol blocks; the said receiving end demodulates the incorporated data symbol blocks, and generates the received data. This scheme can be called as the block repeating spread diversity transmission technology for short, it is based on the information symbol in the time-frequency domain two-dimensional grid point. This scheme doesn't restrict the modulating signal generation manner at bottom, it can form a new multiple address/multiple path transmission scheme, and can be incorporated with the other key technologies in the existing mobile communication.

Description

Signal transmission method, device and communication system

The present invention relates to signal transmission technologies, and in particular, to a wireless signal transmission method, apparatus and communication system in a wide-band time-frequency domain two-dimensional space. Background technique

In the existing wireless communication system, there are two types of signal transmission: one is a signal transmitted by a base station, and the signal received by the terminal and demodulated and processed is called downlink transmission, and the other is transmitted by the terminal. Signal, the signal transmission that the base station receives and demodulates, is called uplink transmission.

In the downlink transmission, in order to be able to simultaneously send data to multiple end users in a certain period of time, the base station needs to adopt a resource allocation manner, so that data of multiple users can share the bandwidth and time resources of the system during this time. During this time, data of multiple users is sent out within the system bandwidth through data multiplexing. This mode is called downlink multi-user data multiplexing.

In the uplink transmission, multiple terminal users are located in different areas covered by the cell signal, and the distances from the base station are different. During a certain period of time, multiple terminals need to send data to the base station to communicate with the base station. In this way, during this time, multiple end users share the bandwidth and time resources of the system, and the bandwidth and time resources of the system are allocated to each user in a certain manner through resource scheduling, and multiple end users are The data is sent to the base station, and the method is called uplink multiple access mode.

Under normal circumstances, the downlink multi-user data multiplexing mode and the uplink multiple access mode may be collectively referred to as an uplink and downlink multiple access mode. '

For the uplink and downlink multiple access methods, there are three basic types of time division multiple access (TDMA), frequency division multiple access (FDMA), and code division multiple access (Code Division Multiple Access). , CDMA), and how they are mixed. TDMA divides time into multiple small time slices during the transmission time period. Each time slice can be individually assigned to one end user. Other users cannot make the time at this time. With this on-chip resource, a single user occupies all of the system bandwidth in time. The FDMA mode is that the system bandwidth resource is divided into a plurality of narrow frequency bands, each of which is occupied by a single user. In the CDMA mode, each user spreads the information to the entire frequency band with a unique code sequence. Multiple users occupy the same time and bandwidth resources in the system, and different users use different spreading code sequences for separation. The FDMA method is adopted in the first generation mobile communication system, and the second generation and third generation mobile communication systems adopt the TDMA and CDMA methods.

For future broadband wireless communication systems, as the bandwidth increases, the multipath interference of the wireless channel will be significantly enhanced. If the traditional multiple access method, such as TDMA or CDMA, is still used, the symbol width of the high-speed information stream is relatively narrow due to the delay spread of the wireless channel, and the multipath interference caused by the increase of the bandwidth will cause serious Intersymbol interference, which degrades the demodulation performance of the signal. To overcome these multipath interferences, a balanced approach can be used. Since the number of multipaths is large in a wideband system, the traditional time domain equalization is used, the number of taps of the filter is large enough, the training symbols are sufficient, and the training time is long enough, so that the complexity of the equalization algorithm is greatly increased. , the implementation of the system increases complexity, and the performance of the system decreases.

In order to solve the problem of inter-symbol interference and equalizer complexity of broadband wireless communication signals, the industry has proposed to use Orthogonal Frequency Division Multiplexing (OFDM) to improve the performance of demodulated signals. OFDM is one of the FDMA multiple access methods. However, the conventional FDMA technique divides the frequency band into a number of disjoint sub-bands to transmit data streams in parallel, and sufficient guard bands are reserved between the sub-channels. In the OFDM system, because of the orthogonality between the sub-carriers, the frequency of the sub-channels is allowed to overlap each other. Therefore, compared with the conventional FDMA system, the OFDM system can utilize the spectrum resources to the maximum extent, and the OFDM system can be used on the other hand. A fast algorithm for discrete Fourier transform.

OFDM converts high-speed data streams through serial-to-parallel conversion, so that the length of data symbols on each sub-carrier is relatively increased, thereby effectively reducing inter-symbol interference caused by time dispersion of the wireless channel, and reducing the complexity of equalization in the receiver. By frequency domain equalization, the receiver can be very easy to process signals.

The OFDM signal generation method is as shown in FIG. 1. If using OFDM symbols, due to multiple The orthogonal subcarriers perform data transmission, and different users can occupy different subcarriers, thereby realizing multi-user multiplexing and multiple access. However, the OFDM multiple access method also has disadvantages. For a pure OFDM system, when applied to a cellular mobile system, if the same frequency networking mode is used, there is a large interference in the small interval. The reason is that when users of different cells transmit and receive data using the same subcarrier, they will interfere with each other with the transmitting and receiving signals of the terminal users of the neighboring cells. Especially in the case of the cell edge, the terminal is closer to other cells, and the arrival signals of other cells will be stronger. When the terminal receives and transmits data, the signals of the neighboring cells will have serious mutual mutuality, which makes The communication performance of the cell edge terminal deteriorates drastically.

In order to achieve signal interference in adjacent cells in the case of co-frequency networking, a related OFDM improvement scheme has been proposed. The main solution is the combination of CDMA and OFDM. At present, there are mainly three types of multiple access methods combining CDMA and OFDM, which are called multi-carrier code division multiple access (Multi-Carrier CDMA, MC-CDMA) and multi-carrier direct spread code division multiple access (Multi- Carrier Direct-Sequence CDMA, MC-DS-CDMA), and Orthogonal Frequency Code Division Multiple Access (OFCDMA), which combines two-dimensional spread spectrum and OFDM in time-frequency domain.

The signal generation method of MC-CDMA is as shown in Fig. 2A. In the MC-CDMA of Fig. 2A, each symbol in a data stream is first subjected to spreading processing, and the spreading code length is N, and the spread data is mapped to N subcarriers of OFDM modulation. Compared with the OFDM method, the MC-CDMA multiple access method has the advantages that frequency diversity can be utilized and neighbor cell interference of the same frequency network can be reduced.

The signal generation method of MC-DS-CDMA is as shown in Fig. 2B. Different from the signal generation method of MC-CDMA, the spread spectrum of MC-DS-CDMA is to spread each symbol on each subcarrier, that is, to spread the spectrum in time, and obtain time diversity gain. It can reduce the neighbor cell interference of the same frequency network.

On the basis of the above-mentioned multiple access method combining CDMA and OFDM, there is also a method of combining two-dimensional spread spectrum and OFDM in the time-frequency domain, which is called OFCDM.

The above-mentioned MC-CDMA and MC-DS-CDMA and the OFDM scheme of time-frequency domain two-dimensional spread spectrum adopt a combination of CDMA and OFDM. These CDMA and OFDM combined parties In this way, a certain diversity gain and the capability of resisting multiple access interference can be obtained, and the multi-cell co-frequency networking can be easily realized. However, there are some common problems in these solutions: The allocation and scheduling of resources and the coordinated control of interference are not flexible and convenient. When the receiver performs multiple access interference cancellation, it requires a large price (acquiring the sender information, receiving processing complexity). ), channel fading and interference can cause sudden errors in some symbols. Summary of the invention

The invention provides a signal transmission method, device and system to improve flexibility of resource allocation scheduling and coordinated control of interference; further improve system performance and reduce complexity of receiving processing.

A method of transmitting a signal, comprising the steps of:

And weighting the basic unit block mapped by the data symbol block by using a weighting factor sequence to obtain a plurality of repeating unit blocks corresponding to the basic unit block;

Each repeating unit block is mapped to a designated time-frequency location, respectively, and the signal of the specified time-frequency location is transmitted.

' A method of transmitting a signal, including steps:

Performing weighted repetition modulation on the generated data symbol block by using a weighting factor sequence to obtain a plurality of repeated data symbol blocks corresponding to the data symbol block;

And respectively mapping the plurality of repeated data symbol blocks to a physical resource block to generate a repeating unit block, and mapping each repeated unit block to a specified time-frequency position;

Sending a signal of the specified time-frequency location.

A method of receiving a signal, comprising the steps of:

Receiving a signal and demodulating a plurality of data symbol blocks from a plurality of repeated unit blocks of a specified time-frequency location;

Merging the plurality of data symbol blocks;

The combined data symbol block is demodulated to generate received data.

A method of receiving a signal, comprising the steps of:

When receiving a signal and adjusting the repeating unit blocks of a plurality of specified time-frequency positions to the same position On the frequency unit;

Obtaining a channel estimate according to the pilot symbols, and combining the repeated unit blocks according to the channel estimation; demodulating the weighted and combined repeated unit blocks to obtain a data symbol block;

The data symbol block is demodulated to generate received data.

A signal transmission method includes the steps of:

The transmitting end performs weighted repetition modulation on the basic unit block mapped by the data symbol block by using a weighting factor sequence to obtain a plurality of repeating unit blocks corresponding to the basic unit block;

Transmitting, by the transmitting end, each repeating unit block to a specified time-frequency position, and then transmitting a signal of the time-frequency position;

The receiving end demodulates a plurality of data symbol blocks from the received plurality of repeating unit blocks, and merges the plurality of data symbol blocks;

The receiving end demodulates the combined data symbol block to generate received data.

A signal transmission method includes the steps of:

The transmitting end performs weighted repetition modulation on the basic unit block mapped by the data symbol block modulation by using a weighting factor sequence to obtain a plurality of repeating unit blocks corresponding to the basic unit block;

Mapping each repeating unit block modulation to a specified time-frequency location;

Transmitting the signal of the specified time-frequency location;

The receiving end receives the signal, and demodulates the corresponding data symbol block from the repeated unit blocks of the plurality of specified time-frequency positions respectively;

The receiving end combines the demodulated plurality of data symbol blocks;

A signal transmission method includes the steps of:

The transmitting end performs a weighted repeated modulation mapping on the generated data symbol block by using a weighting factor sequence to obtain a plurality of repeated data symbol blocks corresponding to the data symbol block;

And respectively mapping the plurality of repeated data symbol blocks to a physical resource block to generate a repeating unit block, and separately modulating each repeated unit block to a specified time-frequency position;

Transmitting the signal of the specified time-frequency location; The receiving end receives the signal, and demodulates the corresponding data symbol block from the repeated unit blocks of the plurality of specified time-frequency positions respectively;

The receiving end combines the demodulated plurality of data symbol blocks;

A signal transmission method includes the steps of:

Transmitting the signal of the specified time-frequency location;

The receiving end receives the signal, and adjusts the repeated unit blocks of the plurality of specified time-frequency positions to the same time-frequency position;

Obtaining a channel estimate according to the pilot symbols, and combining the adjusted repeated unit blocks according to the channel estimation; demodulating the combined repeated unit blocks to obtain a data symbol block;

The data symbol block is demodulated to generate received data.

A signal transmission method includes the steps of:

Transmitting the signal of the specified time-frequency location;

The data symbol block is demodulated to generate received data.

A device for transmitting a signal, comprising:

a first modulating unit, configured to perform block and modulation on the data to be sent, to generate a data symbol block; a second modulating unit, configured to modulate the data symbol block and map to a physical resource block to generate a basic unit block;

a third modulating unit, configured to perform weighted repetition modulation on the basic unit block by using a weighting factor sequence, and map the plurality of repeating unit blocks obtained by weighting the basic unit block to the specified time-frequency position respectively;

a communication unit that transmits a signal of the specified time-frequency position and receives a signal.

A device for transmitting a signal, comprising:

a first modulating unit, configured to perform block and modulation on the data to be transmitted, to generate a data symbol block, and a second modulating unit, configured to perform weighted and repeated modulation on the generated data symbol block by using a weighting factor sequence to obtain the data symbol block Corresponding multiple blocks of repeated data symbols;

a third modulating unit, configured to separately map the plurality of repeated data symbol blocks to a physical resource block to generate a repeating unit block, and map each repeating unit block to a specified time-frequency position;

A device for receiving a signal, comprising:

a communication unit, configured to send or receive a signal;

a first demodulation unit, configured to demodulate a plurality of data symbol blocks from the repeated unit blocks of the plurality of specified time-frequency positions after receiving the signal;

a second demodulation unit, configured to combine the plurality of data symbol blocks;

And a third demodulation unit, configured to demodulate the combined data symbol block to generate received data.

A device for receiving a signal, comprising:

a communication unit, configured to send or receive a signal;

An adjusting unit, configured to adjust, after receiving the signal, a plurality of repeated unit blocks of the specified time-frequency position to the time-frequency unit of the same position;

a first demodulation unit, configured to perform weighting processing on each of the repeating unit blocks by using pilot symbols, and combine and weight the processed repeated unit blocks;

And a second demodulation unit, configured to demodulate the combined repeating unit block to obtain a data symbol block, and a third demodulation unit, configured to demodulate the data symbol block to generate received data. A communication system comprising:

a first device, configured to perform weighted repetition modulation on a basic unit block mapped by a data symbol block by using a weighting factor sequence to form a plurality of repeating unit blocks; and respectively mapping each repeated unit block to a specified time-frequency position, Transmitting the signal of the time-frequency position;

a second device, configured to receive a signal sent by the first device, and demodulate a plurality of data symbol blocks from a plurality of repeating unit blocks, and combine the plurality of data symbol blocks; and demodulate the combined data A symbol block that generates received data.

A communication system comprising:

a first device, configured to perform weighted repetition modulation on the generated data symbol block by using a weighting factor sequence, to obtain a plurality of repeated data symbol blocks corresponding to the data symbol block; and separately modulate the plurality of repeated data symbol blocks to The physical resource block generates a repeating unit block, and maps each repeated unit block to a specified time-frequency position and then transmits the signal of the specified time-frequency position;

A communication system comprising:

a device for performing weighted repetition modulation on a basic unit block mapped by a data symbol block by using a weighting factor sequence to form a plurality of repeating unit blocks; and respectively mapping each repeated unit block to a specified time-frequency position, Transmitting the signal of the time-frequency position;

a second device, configured to receive a signal sent by the first device, adjust a repeating unit block of a plurality of specified time-frequency positions to a time-frequency unit of the same position, and perform a repeating unit block by using a pilot symbol Weighted combining; and demodulating the combined unit block to obtain a block of data symbols, and then demodulating the block of data symbols to generate received data.

A communication system comprising:

a first device, configured to perform weighted repetition modulation on the generated data symbol block by using a weighting factor sequence, to obtain a plurality of repeated data symbol blocks corresponding to the data symbol block; and separately modulate the plurality of repeated data symbol blocks to The physical resource block generates a unit block, and maps each unit block separately Transmitting the signal of the specified time-frequency position after the specified time-frequency position;

a second device, configured to receive a signal sent by the first device, adjust a plurality of repeating unit blocks of the specified time-frequency location to a time-frequency unit of the same location, and weight the repeating unit block by using pilot symbols Processing, and combining the weighted processed repeating unit blocks; and demodulating the combined repeated unit blocks to obtain data symbol blocks, and demodulating the data symbol blocks to generate received data.

Since the present invention adopts block-based information transmission, compared with the existing OFDM-type broadband transmission technology, the technical solution of the present invention can coordinate the relationship between system resources and system performance, and can better handle multi-cell multi-user signals. The interference can make the broadband co-frequency networking more easily and improve the capacity and performance of the system.

Compared with existing CDMA and OFDM technologies such as MC-CDMA and MC-DS-CDMA and time-frequency domain two-dimensional spread spectrum OFDM, the block repetition transmission scheme can better cooperate with the packet transmission mechanism. To improve system performance and simplify system design and implementation; block repetitive transmission scheme is flexible and convenient for resource allocation scheduling and interference coordination control, and can easily balance the benefits of scheduling and diversity; block repetitive transmission scheme is receiving The terminal needs to pay a small price for the multiple access interference cancellation (there is less requirement for the sender information and the reception processing complexity is low); the block repetition transmission can better suppress the deterioration of the system performance due to channel fading and burst interference. .

Since the block repetition transmission scheme is implemented based on the repetition of basic physical resource blocks, and does not limit the underlying modulation multiple access scheme, the block repeated multiple access scheme (BRDM) can also be compared with various basic multiple access methods. Combined, a variety of multiple access/multiplexing schemes are formed. For example, combined with Interleaved FDMA (IFDMA), the BR-IFDMA multiple access method can be obtained; combined with DFT-S-OFDM (DFT-Spread OFDM), the BR-DFT-S-OFDM method can be obtained ( Usually, both IFDMA and DFT-S-OFDM are called Single-Carrier FDMA (SC-FDMA). Therefore, BRDM and their combination can also be called BR-SC-FDMA. ).

The technical solution of the present invention may be simply referred to as a block repetition spread diversity transmission technology, and is a transmission scheme based on information symbols on a two-dimensional grid point in a time-frequency domain. In fact, the shield is to repeat the multi-symbol repetition of the time-frequency resource block in the entire available time-frequency domain resource, thereby realizing the extended and repeated transmission of the signal, while receiving Multi-symbol merging can be performed using appropriate diversity techniques. The solution of the present invention can effectively combat various interference problems in broadband mobile communication. Since different users or channels can be distinguished by selection of a weighting factor sequence, the inventive scheme can implement multiplexing transmission of multiple users or multiple signals on the same time-frequency resource block. DRAWINGS

1 is a schematic diagram of OFDM signal generation and processing in the prior art;

2A is a schematic diagram of signal generation of MC-CDMA in the prior art;

2B is a schematic diagram of signal generation of MC-DS-CDMA in the prior art;

3 is a schematic diagram of channel resources of an OFDM modulation method in the prior art;

4 is a schematic diagram of a physical resource block in an OFDM modulation mode in the prior art; FIG. 5 is a schematic diagram of a pilot and data setting manner in a physical resource block in the prior art; FIG. 6 is a block diagram of a single user in an embodiment of the present invention; Schematic diagram of repeated transmission methods;

FIG. 7 is a schematic diagram of a block repeat transmission mode of two users according to an embodiment of the present invention; FIG.

8A is a schematic structural diagram of a communication device for transmitting signals according to an embodiment of the present invention; FIG. 8B is a flowchart of generating and transmitting signals by three-level modulation according to an embodiment of the present invention; FIG. 9B is a schematic structural diagram of another base station according to an embodiment of the present invention; FIG. 10 is a schematic diagram of another base station according to an embodiment of the present invention; FIG.

FIG. 11A is a schematic structural diagram of a communication apparatus for receiving and processing signals according to an embodiment of the present invention; FIG.

11B is a flowchart of generating received data by three-stage demodulation according to an embodiment of the present invention; FIG. 12A is a schematic structural diagram of another communication apparatus for receiving and processing signals according to an embodiment of the present invention;

12B is a flowchart of another method for generating received data by three-stage demodulation according to an embodiment of the present invention; FIG. 13A and FIG. 13B are schematic structural diagrams of a communication apparatus according to an embodiment of the present invention;

FIG. 14 is a schematic structural diagram of a block repeat communication system according to an embodiment of the present invention; FIG. 15A, 15B, 15C, and 15D are flowcharts showing signals transmitted between a base station and a mobile terminal according to an embodiment of the present invention;

FIG. 16 is a schematic diagram of block orthogonal transmission pilot orthogonal multiplexing according to an embodiment of the present invention. detailed description

The information transmission in this embodiment is based on repeated transmission and multiplexing and multiple access of basic physical resource blocks, which is simply referred to as a block repetition transmission scheme, that is, BR (Block Repeat), and block repetition multiplexing/block repeated multiple access. The scheme, that is, BRDM (Block Repeat Division Multiplex)/BR MA (Block Repeat Division Multiple Access), may also be referred to as a block repetition spread diversity transmission technique.

Since the multiple access method in this embodiment is based on the repeated implementation of the basic physical resource block, the modulation multiple access mode of the 4 氐 layer is not limited, and the block repetition mode can be combined with various multiple access modes to form multiple types. Compound solution. For example, in combination with OFDM, it may be simply referred to as Block Repeat Orthogonal Frequency Division Multiplexing (BR-OFDM) / Block Repeat Orthogonal Frequency Division Multiple Access (BR-OFDMA); and combined with SC-FDMA to form a BR-SC-FDMA method.

The following mainly describes a block repetitive transmission method in combination with OFDM, that is, BR-OFDM as an example.

In the OFDM modulation mode, a specific example of the allocation and use of channel resources is shown in FIG. In Fig. 3, a physical resource block (PRB) is a basic unit for mapping transmission data to a physical layer, and nine physical resource blocks are allocated to users 1-6. For each physical resource block, its structure is shown in Figure 4.

In the OFDM modulation mode, the channel resource is a structure of time-frequency two-dimensional. Figure 4 shows an OFDM time-frequency resource block unit that occupies a portion of the entire OFDM time-frequency resource. The physical time-frequency resource block unit contains ^Ν τ OFDM symbols in time and includes ^N F in the frequency domain.

OFDM subcarriers, the total number of symbols included in the time-frequency resource block is ⁷ ^ - ^ x ^ symbols, and the symbols on a time-frequency resource block (including data symbols and pilot symbols) can be expressed as:

Wherein each symbol can be a pilot symbol or a data symbol. The entire OFDM time-frequency resource contains one or more time-frequency resource block units. In each physical resource block, a corresponding pilot symbol is set to perform channel estimation, and a specific example of a physical resource block and its pilot and data is shown in FIG.

The size of the basic physical resource block determines the minimum unit and granularity of the transmission rate. When designing the size of the basic physical resource block, it can be considered that the time domain width of the resource block is related to the coherence time in the frequency time dual selective channel, and the frequency domain width of the resource block is related to the coherence frequency. This makes it possible to make a compromise between the design difficulty of the pilot symbols, the channel estimation, and the complexity of the equalization algorithm.

In this embodiment, a BR-OFDM instance of a single user is shown in FIG. 6. Among them, the unit block (BU, Block Unit) is the basic unit of block repetition, and one unit block is repeatedly transmitted 6 times, which are called repeated unit blocks BUI, BU2, ..., BU6, that is, 6 unit blocks are transmitted. The same data. In this embodiment, the number of block repetitions is defined as a block repetition factor (RF). In the specific example shown in Fig. 6, RF=6. The repeating unit block of Fig. 6 is an arrangement in the direction of the integrated time-frequency domain. In other embodiments, the six unit blocks may also be arranged horizontally, vertically, or in a diagonal direction.

Each repeated block units weighted by a weighting factor, the transmitting end gives a block repeat weighting factor sequence (or referred to as a repeat code RC) to ^{^{^{(C C i ...... C.)}}} ; In the block repeat transmission, the weighted block units Repeat and map to the specified time-frequency location. For a single user, the weighting factors used by each repeating unit block may be the same or different; if the same weighting factor is used (ie, the weighting factor sequence is all ones), the processing at the time of demodulation can be binned.

Let the data symbols (L symbols) to be transmitted by one unit block can be expressed as: Data d is mapped to the unit block according to a certain correspondence. Symbol on a unit block (total The number of ^- ^ ^ , including data symbols and pilot symbols, can be expressed as:

0,0 0,1 ' * ' ^Ο, ρ-Ι

1,0 1,1 " * · ^Ι,Νρ-Ι

s =

|_ Ν _Τ -1,0 ^J N _T -1,1 ... 1⁄2 _T -1,N _F -1 _ The time domain signal corresponding to the unit block is expressed as ^S u _B ( , which is limited in time and frequency A signal in a block. A block is adjusted to the specified time-frequency position ( ), which is equivalent to a time shift ( ^ ) and a frequency shift ( ), which can be expressed as 3⁄4^一^^ ² ^—Set block repetition The time-frequency position is: ( ), where i=0, l, ..., RF-1. In block repetition transmission, the unit block is weighted repeatedly (block repetition weighting factor sequence ^...) and mapped to the specified The time-frequency position, the signal after the block is repeated can be expressed as:

^S Block Repeat (

One by one

RF-l

A schematic diagram of a BR-OFDM example in which _{∑c iSuB 2 strips} multiple users is shown in FIG. 7. In this example, two users occupy the same time-frequency channel resources for block retransmission. In the multi-user block repetition transmission, each user still transmits signals in a single-user manner only in the case that they occupy the same time-frequency channel resources, and the block repetition weighting factor sequence (repeat code RC) of each user is different. The receiving end relies on different repetition codes to separate signals occupying the same time-frequency resource. In the direction along the power/repetition code axis in Figure 7, the upper part is user 1 and the lower part is user 2. When the weighting factor sequences of the individual users are orthogonal to each other, the size of the block repetition coefficients determines the number of user signals that can remain completely orthogonal within the cell.

The above embodiment uses the term "user" to express the concept of a multipath signal. In practice, this "user," may be an end user device that uses one signal to communicate wirelessly with a base station, but in a broader sense, "User" refers to each signal that can be superimposed on the same time-frequency channel resource. From the perspective of the terminal, each terminal device can pass multiple signals and bases on the same time-frequency channel resource. The station performs information transmission, and the signals of the plurality of terminal devices can be naturally superimposed in the air interface transmission process, and the base station device can perform differentiation and demodulation of each channel signal. From the perspective of the base station, the multiple signals on the same time-frequency channel resource may be for different terminal devices, and the terminal device only needs to demodulate one or more signals belonging to itself from the received superposed signal.

In a cell, the multiplexable signals on the time-frequency resource block can be distinguished by a set of labels, and each label can correspond to a weighting factor sequence. Of course, when the base station device has spatial division multiple access capability, a weighting factor sequence can even be allocated to multiple end users in the cell for use.

In this embodiment, the transmitting end of the data may have multiple manners when generating the repeating unit block, for example, after mapping the generated data symbol block DB modulation to the physical resource block generating unit block BU, using the weighting factor sequence to the unit block. Performing weighted repetition modulation (or block repetition modulation) to obtain a plurality of repeated unit blocks corresponding to each unit block; or performing weighted repetition modulation on the generated data symbol blocks by using a weighting factor sequence to obtain corresponding data symbol blocks Multiple blocks of repeated data symbols, and then each block of repeated data symbols is mapped to a repeating unit block.

In this embodiment, the data to be transmitted (via channel coding, rate matching, and combined mapping) generates a transmission signal through three-level modulation. In a manner of implementing three-level modulation, the three-level modulation is: It is the transmission data modulation, the second stage is the unit block modulation, and the third stage is the block repetition modulation. A device capable of realizing the three-level modulation, as shown in FIG. 8A, includes: a first modulating unit 80, a second modulating unit 81, a third modulating unit 82, and a communication unit 83; wherein the first modulating unit 80 is configured to complete Data modulation to be transmitted, generating a block of data symbols; second modulation unit 81 is configured to perform unit block modulation into basic unit blocks; third modulation unit 82 is configured to perform block repetition modulation to generate block repetition units, and map them to specified times Frequency position; the communication unit 83 is configured to transmit the signal of the specified time-frequency position and the received signal. The device may be a mobile terminal or a base station, and an example of a process for transmitting a signal is shown in Figure 8B:

Step 800: Modulate the data to be sent (the first stage transmits data modulation), that is, the data to be transmitted is modulated into blocks, and the data symbol block DB is generated.

In this step, data modulation refers to the usual digital modulation of the transmitted data, such as: Binary Phase Shift Keying (BPSK), Quadrature Phase Shift Keying (Quarature) Phase Shift Keying, QPSK), 16 QAM, 64QAM, etc.; The block processing is to determine the data transmitted by a unit block by the size of one unit block. A unit block provided data to be transmitted to the L data symbols, through the data symbol block (DB) after a first stage of data modulation may be expressed _{as: d = [d Q, d} l, - - -, d L]

Step 801: Perform unit block modulation (second level modulation), that is, modulate a block of data symbols, and map it to a physical resource block to generate a basic unit block.

In this step, the data symbol block d is mapped to the physical resource unit block according to a certain correspondence, and other symbols such as pilots are inserted. For systems preclude the use of the OFDM scheme, a time unit block frequency domain in the time frequency resource unit, and ^Ν the symbols in the frequency domain in the time domain carrier configuration?. The symbols on a unit block (the total number ^{= x} ^ , including data symbols and pilot symbols) can be expressed as:

^{_{...? s = Ν τ}} -1'0 5 Ν Τ -1,1 ½ T -1, N F -... 1-

Given all the symbols s corresponding to the unit block, a time domain signal of a unit block can be generated according to the OFDM method, which can be expressed as ^SuB ^), which is a signal ^whose time and frequency are limited to one unit block.

Each unit block can have its own dedicated pilot, which is a self-contained physical resource block that can be independently demodulated, that is, the channel can be estimated by the pilot symbols in the unit block at the receiving end, and the signal of the unit block is performed. Coherent demodulation. For each user, the pilot symbols within each unit block and the time-frequency grid locations they occupy are known to both the transmitting and receiving ends. '

Step 802: Perform block repetition modulation (third level modulation), perform weighted repetition (BR) on each basic unit block to generate a plurality of repeated unit blocks, and respectively map the repeated unit blocks to a specified time-frequency position.

The time-frequency positions corresponding to each repeating unit block are consecutively arranged or discontinuously arranged in the time domain; or, the time-frequency positions corresponding to each repeating unit block are consecutively arranged or discontinuously arranged in the frequency domain; or, each The time-frequency positions corresponding to the repeating unit blocks are consecutively arranged or discontinuously arranged in the time-frequency domain. The specific arrangement pattern may be arranged in the time domain direction, sequentially arranged in the frequency domain direction, integrated in the frequency domain direction, and arranged in the oblique direction in the time-frequency resource block as a basic unit. The method is selected in a manner, and the specific manner can be pre-agreed and is known by the transmitting end and the receiving end. In this way, in the network on the side of the base station, there is generally an entity that performs resource allocation. When a terminal device and the base station need to perform data transmission, the resource allocation entity allocates resources for the terminal, and specifies a mapping of the repeated unit block. The reference point of the time-frequency position, and the terminal and the base station respectively according to the predetermined arrangement pattern, according to the reference reference point, the time-frequency position to which each repeated unit block should be mapped can be known. Of course, the "block" in this embodiment is also not limited to the shape of a rectangle. The modulated signal is referred to as unit block represents ^S UB (, which is a time and frequency restriction signal in a unit block. Cell block is adjusted to a specified time-frequency location (), is equivalent to a time shift () And the frequency shift ( ) can be expressed as ^{uB )} .

Let the time-frequency position of the block repetition be: ( ), where i=0, l, ..., RF-1. In block repeat transmission, the unit block repeats code ^C through the block. ^C i... CRF-I weights the repetition and maps to the specified time-frequency location. The signal after block repetition modulation can be expressed as:

' ^/ . ⁽ⁱ - '.) + C, s _m (t - 1, ² - w + . · · + C _RF _ _]SuB (i - - ι ^(ί - - t)e ^{2jr/i (i} a'')

=0

In the above signal representation, the unit block signal is weighted as a whole, and the pilot symbols carry information about the weighted factor sequence. Therefore, in the case where dedicated pilots are employed and weighted, the data symbols and pilot symbols inside each repeating unit block have the same weighting coefficient. Therefore, in this case, the receiving end can demodulate the signal by channel estimation of the dedicated pilot without having to know the code sequence in advance. Of course, the dedicated pilot symbols may not be weighted.

In this step, the block repetition code... is a sequence of features corresponding to the user (or cell, or channel, etc.), which may be an orthogonal code, a pseudo-random code or other code, or even a truly random The code, that is, randomly generates a code word in real time without having to be predetermined. Because the receiver does not need to know the weighting factor sequence under the condition of weighting the dedicated pilot, this brings more flexibility to the system implementation.

Step 803: Send a signal of the specified time-frequency position.

In the block repetition modulation, the modulation data contained in each repeating unit block is completely the same, and the order and relative position of the modulated data in each repeating unit block may be exactly the same, or may be performed according to a specified correspondence relationship. Different arrangements.

In another way of implementing three-level modulation, the modulations at each level are: the first level is the transmit data modulation, the second level is the block repeat modulation, and the third level is the unit block modulation. A device capable of realizing the three-level modulation, as shown in FIG. 9A, includes: a first modulating unit 90, a second modulating unit 91, a third modulating unit 92, and a communication unit 93; wherein the first modulating unit 90 is configured to complete Data modulation to be transmitted, generating a block of data symbols; second modulation unit 91 is configured to perform block repetition modulation to generate a block of repeated data symbols; third modulation unit 92 is configured to perform unit block modulation, generate a repeating unit block and map it to a designated The time-frequency position; the communication unit 93 is configured to transmit the signal of the specified time-frequency position and the history signal. The device may be a mobile terminal or a base station, and an example of a process for transmitting a signal is shown in FIG. 9B:

Step 900: Perform transmission data modulation (first stage modulation): block and modulate the transmission data to generate a data symbol block (DB).

The processing of this step is the same as the processing of step 800 in Fig. 8B. The data symbol block can be expressed as: d = [« '', G? _L. Step 901, performing block repetition modulation, that is, weighting the data symbol block to generate a plurality of repeated data symbol blocks:

^Block Repeat = G d = C- — J where ^C '' is the weighting factor for the ith repeat block.

Step 902: Perform unit block modulation, that is, map the repeated data symbol block modulation into a repeating unit block, and map to a specified time-frequency position. Map the data block ^UB1 ° ^{ck Re} P ^e at to the unit block

0,0 0,1 0,N _F -1

'1,0 s.

(i) 1,1 1,N _V -1

N _T -1,0 °N _T -1,1 5- N _X -1,N _F -1

(i)

The signal modulated by the block is represented as ^ B , and the block is adjusted to the specified time-frequency bit —

Set ( ), can be expressed as

The signals that can be generated including the individual repeating unit blocks are:

S Block Repeat

s _B (卜, ' ² )

Dedicated pilot symbols may also be added in this step; further, the pilot symbols in the basic unit block may be processed by using the same weighting factor sequence as the data portion, so that the pilot symbols carry related information of the weighting factor sequence (including weighting factors) Sequence and information that can get a sequence of weighting factors).

Step 903: Send a signal of the specified time-frequency position.

In the processing flow shown in Figs. 8B and 9B, although the order of unit block modulation and block remodulation is different, it is apparent that the same BR-OFDM signal can be generated for the same data to be transmitted.

For the base station, a plurality of sets of modulation units may be included, each set of modulation units having the foregoing first, second, and third modulation units for processing data of one user, and each group of modulation units is processed in parallel; the base station further includes a A merging unit for superimposing signals on repeating unit blocks of the same time-frequency position, and then transmitting the superimposed signals. The structure is as shown in Fig. 10. The processing of each group of modulation units is the same as that described above, and will not be described again.

In the block repetition modulation of the above process, the pilot symbols included in each repeating unit block are weighted by the block repetition weighting factor together with the modulated data block, so that the dedicated pilot symbols carry information of the weighting factor, but are not limited thereto. , you can also weight only the data symbols without weighting the pilot symbols, send The terminal may send the weighting factor sequence or its code to the receiving end before transmitting the data, or may obtain the weighting factor sequence by the receiving end through system configuration. In addition, in the block repetition modulation, the dedicated pilot may not be added, and the receiving end may demodulate by the conjugate of the common pilot and the weighting factor sequence. The common pilot here refers to a common pilot that is inserted at the position of the pilot time-frequency grid point and known to all users in the unit block.

At the receiving end, the received data needs to be subjected to three-stage demodulation to obtain received data. In an implementation manner, the three-level demodulation is: first level is unit block demodulation, and second level is block repetition. Demodulation, the third stage is data demodulation. A device capable of realizing the three-level modulation, as shown in FIG. 11A, includes: a communication unit 110, a first demodulation unit 111, a second demodulation unit 112, and a third demodulation unit 113; wherein the communication unit 110 is used Transmitting and receiving signals; the first demodulation unit 111 is configured to perform unit block demodulation at a specified time-frequency position to generate a data symbol block; and the second demodulation unit 112 is configured to perform block repetition demodulation to obtain data to be demodulated. The symbol block; the third demodulation unit 113 is configured to perform demodulation of the block of data symbols to be demodulated, and generate received data. The device may be a mobile terminal or a base station, and an example of the process of receiving and demodulating signals is shown in FIG. 11B:

Step 1100, receiving a signal.

Step 1101: Perform unit block demodulation (first stage demodulation), that is, perform inverse mapping on each repeated unit block at a specified time-frequency position to obtain a data symbol block.

In this step, the channel estimator may perform channel estimation by using a pilot symbol to obtain a channel response (channel estimation result) of the received signal, and the channel response is for a user or a signal in a time-frequency resource block to which the pilot symbol belongs. In the embodiment, the algorithm used for channel estimation and the pilot symbols that are relied on are not limited in this embodiment; then, the channel symbols in the unit block can be channel-equalized by using the obtained channel response to obtain the equalized data symbols. A simple special case of the equalization algorithm is to deconvolute the original received data symbols; the next step is to detect the equalized data symbols; the detected data symbols are then obtained according to the correspondence with the data symbol blocks. A block of data symbols corresponding to the repeating unit block after the detection is received. The output of this step is (usually soft data): "Block Repeat ^3⁄4 BR0, d"B ⁽ⁱ⁾ R1, ' ^BRL-l

If the dedicated pilot symbol is used in the corresponding transmitted signal, and the pilot and the data symbol are weighted by the same repetition code, the channel response obtained by using the pilot can directly obtain the detection result of the data symbol; if the transmitting end The repetition code only weights the data symbols, and does not weight the pilot symbols, and further removes the weighting factors in the detection results (eg, except the weighting factor, or the conjugate of the weighting factors) to recover the data.

Step 1102: performing block repetition demodulation (笫 secondary demodulation), that is, combining data symbol blocks obtained by each repeated unit block to obtain a data symbol block to be demodulated. ·

In this step, the combination of the respective data symbol blocks may adopt a method of selective combining, maximum ratio combining, equal gain combining, and the like. In the maximum ratio combining, each repeated data block is multiplied by a factor σ, . , so that the signal is proportional to the signal to noise ratio, and then summed to obtain a block of data symbols to be demodulated:

RF-1

Block Repeat

i=0 Step 1103: Perform data demodulation (third-level demodulation), that is, demodulate the obtained data symbol block to be demodulated to generate received data.

In this step, normal digital modulation and demodulation is performed according to the modulation method of the transmitting end, such as: BPSK, QPSK, 16QAM, 64QAM, and the like. The output of the data symbol can be a hard decision output or a soft output for subsequent soft decision decoding.

In another implementation manner, the three-level demodulation is: the first stage is block repetition demodulation, the second stage is unit block demodulation, and the third stage is data demodulation. A device capable of realizing the three-level modulation, as shown in FIG. 12A, includes: a communication unit 120, an adjustment unit 121, a first demodulation unit 122, a second demodulation unit 123, and a third demodulation unit 124; wherein, the communication The unit 120 is configured to send and receive signals; the adjusting unit 121 is configured to adjust the repeated unit blocks of the plurality of specified time-frequency positions to the time-frequency unit of the same position; the first demodulating unit 122 is configured to utilize the multiple repetitions The channel estimation of each repeating unit block in the unit block and the conjugate of the weighting factor sequence are weighted by the repeating unit block, and then The weighted unit blocks are combined; the second demodulation unit 123 is configured to demodulate the combined unit block to obtain a data symbol block; and the third demodulation unit 124 is configured to generate the received data according to the data symbol block. The device may be a mobile terminal or a base station, and an example of a process of receiving and demodulating signals is shown in FIG. 12B:

Step 1200: Receive a signal.

Step 1201: Adjust a plurality of repeated unit blocks of the specified time-frequency position (the position of which is determined by the block repetition coefficient determined between the transmitting end and the receiving end) to the time-frequency unit of the same position.

Specifically, the step is actually a mathematical operation rather than a physical shift of the signal. For the frequency domain, the essence is to adjust the data symbols in different repeating blocks to the frequency domain reference position as a system. For the time domain, its essence is equivalent to the simultaneous processing of data symbols in different repeating blocks.

Step 1202: Perform block repetition demodulation (first stage demodulation), that is, perform channel estimation by using pilot symbols in the repeating unit block, to obtain a channel response of the received signal, and use each repeating unit block in the plurality of repeating unit blocks. The conjugate of the corresponding channel estimate and the weighting factor sequence weights the repeating unit block, and combines the weighted unit blocks.

Step 1203: Perform unit block demodulation (second stage demodulation), that is, perform inverse mapping on the combined unit block to obtain a data symbol block.

Step 1204: Perform data demodulation (third-level demodulation), that is, demodulate the data symbol block to generate received data.

As described above, if the transmitting end does not include a dedicated pilot in the block repetition modulation, the receiving end can perform demodulation through the conjugate of the common pilot and the weighting factor sequence, and the processing thereof is the same as the foregoing process, and will not be described again.

According to the above, a plurality of communication devices having the foregoing transmitting end function and receiving end function in the present embodiment can be obtained, that is, the communication device includes the structure of any of the devices in FIGS. 8A and 9A and any of FIGS. 10A and 11A The structure of a device, the processing flow of transmitting signals and receiving signals is the same as the foregoing transmitting end and receiving end, respectively. For example, as shown in FIG. 13A, the apparatus includes first, second, and third modulation units, first, second, and third demodulation units, and a communication unit; for example, as shown in FIG. 13B, The device is a base station comprising two sets of modulation units and a set of demodulation units, and a communication unit. In a system having a plurality of the aforementioned communication devices, the communication device transmitting the signal may modulate and transmit the signal by using any one of the two types of transmission signals, and the communication device receiving the signal may adopt the two received signals. Either way, the received signal is demodulated.

Referring to a block repeat transmission communication system shown in FIG. 14, a base station 140 and a plurality of mobile terminals 141, 142, and a base station 140 transmitting a signal to the mobile terminal 141 is shown in FIG. 15A:

Step 1500: The base station 140 performs modulation and division on the data to be sent to the terminal 141 to generate a data symbol block DB.

Step 1501: The base station 140 modulates a block of data symbols and maps it to a physical resource block to generate a basic unit block.

Step 1502: The base station 140 performs weighted repetition modulation on each generated basic unit block by using a weighting factor sequence, generates a plurality of repeated unit blocks corresponding to each basic unit block, and maps each repeated unit block to a specified time. Frequency position.

Step 1503: The base station 140 transmits a signal of the specified time-frequency position after modulating the channel.

Step 1504: The terminal 141 receives the signal sent by the base station 140.

Step 1505: The mobile terminal 141 detects each repeated unit block at a specified time-frequency position and inversely maps to obtain a data symbol block.

Step 1506: The mobile terminal 141 combines the data symbol blocks obtained by the respective repeating unit blocks to obtain a data symbol block to be demodulated.

Step 1507: The mobile terminal 141 demodulates the obtained block of data symbols to be demodulated to generate received data.

Referring to Figure 15B, an example of a process in which base station 140 simultaneously transmits signals to mobile terminals 141, 142 is as follows:

Step 1530: The base station 140 modulates and blocks the data that needs to be sent to the terminals 141 and 142 to generate a data symbol block DB. Step 1531: The base station 140 modulates each data symbol block and maps it to a physical resource block to generate a basic unit block.

Step 1532: The base station 140 performs weighted repetition modulation on the corresponding basic unit block by using the weighting factor sequence corresponding to the mobile terminals 141 and 142, respectively, to obtain a plurality of repeated data symbol blocks corresponding to each basic unit block, and each repeated unit block Map to the specified time-frequency location separately. The sequence of weighting factors of the mobile terminals 141, 142 is different.

According to step 1533, the base station superimposes the signals of the same time-frequency position of the mobile terminals 141, 142. Step 1534: The base station 140 transmits a signal of the specified time-frequency position after modulating the channel.

Step 1535: The terminals 141, 142 receive the signals sent by the base station 140, respectively.

Step 1536: The mobile terminals 141 and 142 respectively adjust the repeated unit blocks of the plurality of specified time-frequency positions to the time-frequency units of the same position.

Step 1537: The mobile terminals 141 and 142 respectively perform block repetition demodulation by using the plurality of repeating unit blocks: performing channel estimation by using pilot symbols in the repeating unit block, and obtaining a channel response of the received signal, by using the multiple repeating units. The channel estimation corresponding to each repeating unit block in the block and the conjugate of the weighting factor sequence weighting the repeated unit block, and combining the weighted unit blocks (the weighting factor sequences corresponding to the terminals 141 and 142 are different, and are combined by weighting Separate the signal).

Step 1538: The mobile terminals 141 and 142 respectively perform inverse mapping on the combined unit block to obtain a data symbol block.

Step 1539: The mobile terminals 141 and 142 respectively demodulate the data symbol block to generate received data.

Referring to Figure 15C, a flow example of the mobile terminal 141 transmitting a signal to the base station 140 is as follows:

Step 1560: The mobile terminal 141 blocks and modulates the data transmitted to the base station 140 to generate a data symbol block (DB).

Step 1561: The mobile terminal 141 performs weighted repetition modulation on each of the generated data symbol blocks by using a weighting factor sequence to obtain a plurality of repeated data symbol blocks corresponding to each of the data symbol blocks.

Step 1562: The mobile terminal 141 maps the repeated data symbol block modulation into a repeating unit block. And map to the specified time-frequency location.

Step 1563: The mobile terminal 141 transmits a signal of the specified time-frequency position after modulating the channel. Step 1564: The base station 140 receives the signal sent by the mobile terminal 141.

Step 1565: The base station 140 performs detection inverse mapping on each repeated unit block at a specified time-frequency position to obtain a data symbol block.

Step 1566: The base station 140 combines the data symbol blocks obtained by the respective repeating unit blocks to obtain a data symbol block to be demodulated.

Step 1567: The base station 140 demodulates the obtained block of data symbols to be demodulated to generate received data.

Referring to Figure 15D, another flow example of the base station 140 transmitting a signal to the mobile terminal 142 is as follows:

Step 1580: The base station 140 blocks and modulates the data sent to the mobile terminal device 142 to generate a data symbol block (DB).

Step 1581: The base station 140 performs weighted repetition modulation on each of the generated data symbol blocks by using a weighting factor sequence to obtain a plurality of repeated data symbol blocks corresponding to each of the data symbol blocks.

Step 1582: The base station 140 maps the repeated data symbol block modulation into a repeating unit block and maps to the specified time-frequency position.

Step 1583: The base station 140 transmits a signal of the specified time-frequency position after modulating the channel.

Step 1584: The base station 140 receives the signal sent by the mobile terminal 141.

Step 1585: The mobile terminal 142 adjusts the repeated unit blocks of the plurality of specified time-frequency positions to the time-frequency unit of the same position.

Step 426, the mobile terminal 142 performs block repetition demodulation by using the plurality of repeating unit blocks: performing channel estimation by using pilot symbols in the repeating unit block, and obtaining a channel response of the received signal, by using the plurality of repeating unit blocks The channel estimation corresponding to each repeating unit block and the conjugate of the weighting factor sequence weight the present repeating unit block, and combine the weighted unit blocks.

Step 1587: The mobile terminal 142 performs inverse mapping on the combined unit block to obtain a data symbol block. Step 1588: The mobile terminal 142 demodulates the data symbol block to generate received data.

In a multiple-access application with block repetition modulation, the pilot symbols of different users/different channels using the same time-frequency resource block are multiplexed and separated by a certain multiplexing method. For example, pilot symbols are transmitted in a time division, frequency division, or code division manner. An orthogonal multiplexing method in which time and frequency do not overlap is shown in Fig. 16.

In summary, in this embodiment, the transmission data is subjected to a data modulation, a unit block modulation, and a block repetition modulation three-level modulation process to generate a block repetition modulation signal (for a block repeated transmission combined with OFDM, the repetition unit block corresponds to a time frequency of one OFDM) Resource block); correspondingly, the receiving end performs three-stage demodulation on the received signal to generate received data, and the method and device are applied to the broadband wireless communication system, which can realize effective and variable rate of information in the wireless communication channel. The transmission can also implement multiplexing and multiple access of wireless communication channel resources. The method and device are applied to a wireless mobile cellular system, which can conveniently implement the same frequency networking and improve the capacity and performance of the system. The proposed method can solve the problem of resource allocation scheduling and interference coordination control (including intra-cell and inter-cell interference) in wireless communication, thereby greatly improving system capacity and performance, and providing broadband wireless communication system. An effective solution.

Although the foregoing mainly describes the combination of block repetition transmission and OFDM as an example, the multiple access method is implemented based on repetition of basic physical resource blocks, and does not limit the low layer modulation multiple access method. Therefore, the block repetition is performed. The multiple access scheme can also be combined with other multiple access schemes to form multiple composite schemes. For example, in combination with SC-FDMA, the BR-SC-FDMA method is constructed, and block repetition modulation and block repetition demodulation are the same as described above.

The technical solution in this embodiment does not limit the combination with other key technologies employed in existing wireless communication systems. For example, the use of uplink power control techniques and downlink power control techniques can be combined in the foregoing scheme. By introducing an uplink power control technique based on signal strength balance criteria or based on a signal-to-interference ratio balance criterion, it is helpful to reduce the interference within the system and increase the capacity of the system. The corresponding power control technique can also be combined in the downstream direction. Since the signals on the time-frequency resource blocks are subject to different channel fading and may be irrelevant, power control can be performed on a per unit basis. Other technologies that can be combined with the technical solutions in this embodiment include multiple inputs and multiple outputs.

(MIMO) antenna technology, soft handoff technology, adaptive code modulation (AMC) technology, hybrid automatic repeat (HARQ) technology, etc.

It is apparent that those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Therefore, it is intended that the present invention cover the modifications and variations of the invention as claimed.

Claims

Rights request

A method of transmitting a signal, the method comprising the steps of:

Performing a weighted repeated modulation mapping on the basic unit block mapped by the data symbol block modulation by using a weighting factor sequence to obtain a plurality of repeated unit blocks corresponding to the basic unit block;

Each repeating unit block modulation is mapped to a specified time-frequency location, respectively, and the signal of the specified time-frequency location is transmitted.

2. Method according to claim 1, characterized in that the pilot symbols are further inserted in the basic unit block.

3. Method according to claim 2, characterized in that the data and the pilots in the basic unit block are processed using the same sequence of weighting factors.

4. The method of claim 3 wherein the sequence of weighting factors is randomly generated.

5. The method of claim 1 wherein a plurality of users or channels transmit signals on the same time-frequency resource.

The method according to claim 5, wherein each of the plurality of users or each of the plurality of channels respectively uses a different weighting factor sequence.

7. The method of claim 1 wherein pilot symbols of different users/different channels are transmitted in a time division, frequency division or code division manner.

8. The method according to claim 1, wherein the time-frequency positions corresponding to each of the repeating blocks are arranged in a predetermined pattern.

9. A method of transmitting a signal, the method comprising the steps of:

Performing a weighted repetition modulation mapping on the generated data symbol block by using a weighting factor sequence to obtain a plurality of repeated data symbol blocks corresponding to the data symbol block;

Sending a signal of the specified time-frequency location.

10. The method according to claim 9, wherein in the process of generating a repeating unit block, Further insert the pilot symbols.

11. The method of claim 10, wherein the data and pilots in the basic unit block are processed using the same sequence of weighting factors.

12. The method of claim 11 wherein the weighting factor sequence is randomly generated.

13. The method of claim 9, wherein the plurality of users or channels transmit signals on the same time-frequency resource.

14. The method according to claim 13, wherein each of the plurality of users or each of the plurality of channels respectively adopts a different weighting factor sequence.

15. The method of claim 9, wherein the pilot symbols of different users/different channels are transmitted in a time division, frequency division or code division manner.

16. The method of claim 9, wherein the time-frequency locations corresponding to each of the repeating blocks are arranged in a predetermined pattern.

17. The method according to claim 9, wherein in the generated plurality of repeating unit blocks, the order and the relative position of the modulated data in each of the repeating unit blocks are the same, or the modulated data is in each of the repeating units. The order and relative position in the block are arranged differently according to the specified correspondence.

18. A method of receiving a signal, the method comprising the steps of:

Receiving signals, and respectively demodulating corresponding data symbol blocks from repeated unit blocks of a plurality of specified time-frequency positions;

Merging and demodulating a plurality of data symbol blocks;

The combined data symbol block is demodulated to generate received data.

The method according to claim 18, wherein in the demodulating the repeating unit block, channel estimation is performed using the weighted pilot symbols in the repeating unit block;

When merging data symbol blocks, the demodulated multiple data symbol blocks are directly merged.

20. The method of claim 18, wherein in the demodulating the repeating unit block, channel estimation is performed using common pilot symbols or unweighted dedicated pilot symbols in the repeating unit block. Meter; and

When merging the data symbol blocks, the corresponding data symbol blocks are weighted by using the conjugate of the weighting factor sequence used for weighting each of the repeated blocks, and the weighted data symbol blocks are combined.

The method according to any one of claims 18 to 20, characterized in that the merging is selective merging, maximum ratio combining or equal gain combining.

22. A method of receiving a signal, the method comprising the steps of:

Receiving a signal and adjusting the repeated unit blocks of the plurality of specified time-frequency positions to the same time-frequency position;

Channel estimation according to pilot symbols, and combining the adjusted repeating unit blocks according to channel estimation results;

Demodulating the merged repeating unit block to obtain a data symbol block;

The data symbol block is demodulated to generate received data.

The method according to claim 22, wherein the pilot symbol is a weighted pilot symbol in a repeating unit, and each repeating unit is directly combined according to a channel estimation result.

24. The method of claim 22, wherein the pilot symbols are common pilot symbols or dedicated pilot symbols that are unweighted in a repeating unit block;

When the data symbol block is merged, the corresponding repeating unit block is weighted by the conjugate of the weighting factor sequence used for weighting each of the repeated blocks, and the weighted processed repeated unit block is combined.

The method of any one of claims 22 to 24, wherein the combining is selective combining, maximum ratio combining or equal gain combining.

26. A signal transmission method, characterized in that the method comprises the steps of:

The receiving end combines the demodulated plurality of data symbol blocks;

27. A signal transmission method, characterized in that the method comprises the steps of:

Transmitting the signal of the specified time-frequency location;

The receiving end combines the demodulated plurality of data symbol blocks;

28. A signal transmission method, characterized in that the method comprises the steps of:

Transmitting the signal of the specified time-frequency location;

Demodulating the merged repeating unit block to obtain a data symbol block;

The data symbol block is demodulated to generate received data.

29. A signal transmission method, characterized in that the method comprises the steps of:

The transmitting end performs weighted repeated modulation mapping on the generated data symbol block by using a weighting factor sequence. Obtaining a plurality of repeated data symbol blocks corresponding to the data symbol block;

Transmitting the signal of the specified time-frequency location;

Demodulating the merged repeating unit block to obtain a data symbol block;

The data symbol block is demodulated to generate received data.

30. A communication device, the communication device comprising:

Blocking and modulating data to be transmitted, generating a unit of data symbol blocks; modulating the data symbol block and mapping to the physical resource block to generate a unit of the basic unit block;

Performing weighted repeated modulation mapping on the basic unit block by using the weighting factor sequence, and mapping the plurality of repeated unit blocks obtained by the basic unit block weighted repetition modulation mapping to the unit of the specified time-frequency position;

A signal for transmitting the specified time-frequency position and a unit for receiving the signal.

The communication apparatus according to claim 30, wherein in the weighted repeated modulation mapping process, data and pilots in the basic unit block are processed using the same weighting factor sequence.

32. The communication device of claim 30, wherein the communication device further comprises: means for demodulating a plurality of data from a plurality of repeating unit blocks of a specified time-frequency location after receiving the signal The unit of the symbol block;

a unit for merging the plurality of data symbol blocks;

A unit for demodulating a combined data symbol block to generate received data.

33. The communication device of claim 30, wherein the communication device further comprises: for adjusting a plurality of repeated time unit positions of the specified time-frequency position to be the same after receiving the signal At a time-frequency position, and performing channel estimation based on pilot symbols, and combining the units of the adjusted repeated unit blocks according to the channel estimation result;

For demodulating the merged repeating unit block to obtain a unit of the data symbol block;

A unit for demodulating the data symbol block to generate received data.

The communication device according to any one of claims 30 to 33, wherein the communication device is a mobile terminal or a base station.

35. The communication device of claim 34, wherein the base station further comprises: means for superimposing signals in the repeating unit block of the same time-frequency location.

36. A communication device, the communication device comprising:

Blocking and modulating data to be transmitted, generating a unit of a data symbol block; performing weighted repeated modulation mapping on the generated data symbol block by using a weighting factor sequence to obtain a plurality of repeated data symbol blocks corresponding to the data symbol block Unit

And a unit for separately mapping the plurality of repeated data symbol blocks to a physical resource block to generate a repeating unit block, and mapping each repeated unit block to a specified time-frequency position;

A signal for transmitting the specified time-frequency location, and a unit for receiving the signal.

37. The communication apparatus according to claim 36, wherein in the weighted repeated modulation mapping process, data and pilots in the basic unit block are processed using the same weighting factor sequence.

38. The communication device of claim 36, wherein the communication device further comprises: means for demodulating a plurality of data from a plurality of repeated unit blocks of a specified time-frequency position after receiving the signal The unit of the symbol block;

a unit for merging the plurality of data symbol blocks;

A unit for demodulating a combined data symbol block to generate received data.

The communication device according to claim 36, wherein the communication device further comprises: for adjusting the repeated unit blocks of the plurality of specified time-frequency positions to the same time-frequency position after receiving the signal Up, and performing channel estimation according to pilot symbols, and combining the units of the adjusted repeated unit blocks according to the channel estimation result;

For demodulating the merged repeating unit block to obtain a unit of the data symbol block; A unit for demodulating the data symbol block to generate received data.

The communication device according to any one of claims 36 to 39, wherein the communication device is a mobile terminal or a base station.

41. The communication apparatus according to claim 40, wherein the base station further comprises: means for superimposing signals in the repeating unit block of the same time-frequency position.

42. A communication device, characterized in that the communication device comprises:

a unit for transmitting or receiving signals;

For demodulating a unit of a corresponding data symbol block from a plurality of repeated unit blocks of a specified time-frequency position after receiving the signal;

a unit for combining the demodulated plurality of data symbol blocks;

It is used to demodulate the combined data symbol block and generate a unit for receiving data.

43. The communication apparatus according to claim 42, wherein channel estimation is performed by using the weighted pilot symbols in the repeating unit block in demodulating a repeating unit block; and when merging data symbol blocks , directly combining the demodulated multiple data symbol blocks.

44. The communication apparatus according to claim 42, wherein channel estimation is performed using a common pilot symbol or a dedicated pilot symbol that is not weighted in a repetition unit block in demodulating a repeating unit block; and

The communication device according to any one of claims 42 to 44, wherein the communication device is a mobile terminal or a base station.

46. A communication device, the communication device comprising:

a unit for transmitting or receiving signals;

For adjusting a plurality of repeating unit blocks of a specified time-frequency position to a unit at the same time-frequency position after receiving the signal;

For obtaining channel estimates based on pilot symbols, and combining the adjusted repeated orders according to channel estimates Unit of the metablock;

A unit for demodulating the data symbol block to generate received data.

47. The communication apparatus according to claim 46, wherein channel estimation is performed by using a weighted repetition-modulated pilot symbol in a repeating unit block to obtain a channel response; and, directly, the demodulated plurality of data symbols are combined Piece.

48. The communication apparatus according to claim 46, wherein the channel estimation is performed by using a common pilot symbol or a dedicated pilot symbol of the unweighted processing in the repeated unit block to obtain a channel response; and, in the merged data symbol block In time, the corresponding data symbol block is weighted by using the conjugate of the weighting factor sequence used when weighting each repeated block, and then the weighted data symbol block is combined.

The communication device according to any one of claims 46 to 48, wherein the communication device is a mobile terminal or a base station.

50. A communication system, characterized in that the system comprises:

a first device, configured to perform weighted repetition modulation mapping on a basic unit block mapped by a data symbol block by using a weighting factor sequence to form a plurality of repeated unit blocks; and respectively mapping each repeated unit block to a specified time-frequency position Transmitting the signal of the time-frequency position;

a second device, configured to receive a signal sent by the first device, and demodulate a plurality of data symbol blocks from a plurality of repeating unit blocks, and combine the plurality of data symbol blocks; and demodulate the combined A block of data symbols that generates received data.

51. A communication system, characterized in that the system comprises:

a first device, configured to perform weighted repetition modulation mapping on the generated data symbol block by using a weighting factor sequence, to obtain a plurality of repeated data symbol blocks corresponding to the data symbol block; and separately modulating the plurality of repeated data symbol blocks Generating a repeating unit block to a physical resource block, and mapping each repeated unit block to a specified time-frequency position and transmitting the signal of the specified time-frequency position;

a second device, configured to receive a signal sent by the first device, and demodulate a plurality of data symbol blocks from a plurality of repeating unit blocks, and combine the plurality of data symbol blocks; and demodulate and merge The data symbol block, generating the received data.

52. A communication system, characterized in that the system comprises:

a second device, configured to receive a signal sent by the first device, adjust a repeated unit block of the specified time-frequency position to a time-frequency unit of the same location, and perform, by using pilot symbols, each repeated unit block Weighted combining; and demodulating the combined unit block to obtain a block of data symbols, and then demodulating the block of data symbols to generate received data.

53. A communication system, characterized in that the system comprises:

a first device, configured to perform weighted repetition modulation mapping on the generated data symbol block by using a weighting factor sequence, to obtain a plurality of repeated data symbol blocks corresponding to the data symbol block; and separately modulating the plurality of repeated data symbol blocks Generating a unit block to a physical resource block, and mapping each unit block to a specified time-frequency position and transmitting the signal of the specified time-frequency position;

a second device, configured to receive a signal sent by the first device, adjust a plurality of repeating unit blocks of the specified time-frequency location to a time-frequency unit of the same location, and weight the repeating unit block by using pilot symbols Processing, and combining the weighted processed repeating unit block; and demodulating the combined repeated unit block to obtain a data symbol block, and demodulating the data symbol block to generate received data